The results of applying the planar nearf i e l d measurement technique t o two experimental phased array antennas are described.Fast and e f f i c i e n t tests are used to determine the required scan area and data point spacings.The use of t h e s e tests e n a b l e o n e t o r e d u c e t h e amount o f d a t a r e q u i r e d f o r some antennas without seriously inc r e a s i n g t h e e r r o r s i n computed f a r -f i e l d p a r ameters.Measurements were made a t d i f f e r e n t d i s t a n c e s from the antennas, with the probe transmitting and receiving, and for both sum and monopulse d i f f e r e n c e p a t t e r n s o f t h e t e s t antenna. Comparisons between t h e f a r -f i e l d p a t t e r n s computed from the nearf i e l d d a t a and t h o s e measured on f a r -f i e l d r a n g e s are presented.An experimental system to t e s t t h e p o t e n t i a performance of a two-pulse, four-element adaptive array has been constructed, using two four-element a r r a y s t o r e p r e s e n t t h e r e c e i v e r f u n c t i o n and 8 s i g n a l s o u r c e s d i s t r i b u t e d i n a z i m u t h t o r e p r e s e n t c l u t t e r . R e s u l t s a r e r e p o r t e d on t e s t s which a r e i n p r o g r e s s t o e v a l u a t e t h e l i m i t a t i o n s o f m u t u a l coupling, receiver match, A I D conversion, and simulated platform motion.The requirements for a t r a n s m i t t e r -r e c e i v e r t h a t i s d i s t r i b u t e d s p a t i a l l y on an a r r a y a r e reviewed and the design of the RF and the power supply packages are described.Details o f t h e major RF components are discussed as w e l l as overa l l parameters such as c o s t t r a d e -o f f s and a r r a y s i g n a l and power d i s t r i b u t i o n problems. a development program f o r a 40 w a t t , S-Band t r a n s m i t / receive module. The module c o n t a i n s , t r a n s i s t o r amplifiers, diode phase shifters, and crossed d i p o l e s f o r o p e r a t i o n w i t h a l l s e n s e s o f l i n e a r and c i r c u l a r p o l a r i z a t i o n s .One hundred modules were fabricated for an experimental 10x 10 suba r r a y .
This article investigates how recollections of a colonial childhood might be re-contextualized within Pacific Ocean cultures and their histories and the fields of island studies and post-colonialism, in the language andmaterials of creative visual art. Examining Crawford’s artist book Picturing the Island (2016) as a case study to resolve these questions, this paper explores whether printed artworks, and particularly artworks employing the book form, present an appropriate opportunity to gather these diverse narratives. It asks: given the historical significance of the printed page and its various origins in news media, the library, literature and fine art, does an artist-made book, with its poetic and discrete significance as an art object, carry a resonance powerful enough to contemporize the past? Dates are important, and histories are so easily forgotten. The creative research project, Picturing the Island, takes the form of an artist book, as a means to measure the capacity of this form of hand-printed artwork to re-present long-forgotten histories. Does the historical significance of the printed page – given its various origins in news media, the library, literature and fine art – carry a resonance powerful enough to draw the past towards, or even into, the present?
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